A solitary fibrous tumor (SFT) is a rare growth that starts from the body’s connective tissue (the “fibrous” framework that supports organs).It can grow...
Glomangiopericytoma is a rare, usually low-grade tumor that grows from perivascular (around-blood-vessel) muscle-like cells in the nasal cavity or nearby sinuses; it often causes...
Hemangiopericytoma/solitary fibrous tumor is a rare tumor that starts from cells around small blood vessels. Today, doctors usually call these tumors “solitary fibrous tumors...
Zimmerman’s tumor” is an older, informal name for hemangiopericytoma—a very vascular soft-tissue tumor that was first described as a growth made of Zimmermann’s pericytes...
Phakomatous choristoma is a very rare, benign (non-cancerous) growth made of lens-like tissue that develops in the wrong place, most often at the inner,...
An orbital schwannoma is a benign (non-cancerous) tumor that grows from Schwann cells. Schwann cells are the cells that wrap around small peripheral nerves...
Orbital pheochromocytoma is an extremely rare tumor that shows up in the eye socket (the “orbit”). Most pheochromocytomas start inside the adrenal glands and...
Mesenchymal chondrosarcoma is a very rare, fast-growing cancer that forms cartilage-like tissue. “Mesenchymal” means it starts from primitive, early connective-tissue cells. “Chondro-” means cartilage....
An orbital lymphangioma is a mass made of abnormal lymphatic channels inside the eye socket (the orbit) and sometimes the eyelids. Doctors now prefer...
Optic nerve sheath meningioma is a slow-growing, usually benign (non-cancerous) tumor that starts in the thin lining (the meninges) that wraps around the optic...